Select the keys from the JSON formatted BGP peer description of which the
values will be used with the frr_bgp_peer_types_up metric. Supports
multiple values (default: type).
Enables the frr_exporter_bgp_prefixes_advertised_count_total metric which
exports the number of advertised prefixes to a BGP peer. This is an option
for older versions of FRR that don't have PfxSent field (default:
disabled).